Abstract

We present a dynamical model of a single catalytic fixed bed in a quench-type ammonia reactor. This model consists of thermodynamics, kinetics, pressure loss, and mass and energy balances, which upon spatial discretisation results in a set of differential-algebraic equations. Compared to similar models in the literature, the main novelties in the model are: 1) a rigorous thermodynamic model using a thermodynamic software library; and 2) a correlation between the gas velocity and the pressure gradient throughout the bed, i.e. the pressure loss is included in the model and used to compute the gas velocity. We investigate steady state solutions and dynamical simulations to understand the behaviour of the single catalytic fixed bed. We determine the optimal steady state operational area and inverse response dynamics are observed. The model can be used to develop model-based control, which is relevant for dynamic and flexible operation of ammonia reactors in a Power-to-Ammonia plant.

Original languageEnglish
Book seriesIFAC Proceedings Volumes (IFAC-PapersOnline)
Volume56
Issue number2
Pages (from-to)6906-6912
ISSN1474-6670
DOIs
Publication statusPublished - 2023
Event22nd IFAC World Congress
- Pacific Convention Plaza Yokohama, Yokohama, Japan
Duration: 9 Jul 202314 Jul 2023
Conference number: 22

Conference

Conference22nd IFAC World Congress
Number22
LocationPacific Convention Plaza Yokohama
Country/TerritoryJapan
CityYokohama
Period09/07/202314/07/2023
SponsorAzbil Corporation, Fujita Corporation, Hitachi, Ltd., Kumagai Gumi Co., Ltd., The Society of Instrument and Control Engineers (SICE)

Keywords

  • Mathematical modeling
  • Dynamical simulation
  • Ammonia reactor
  • Power-to-X

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